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the water needed by our species and our planet. arizona is one of the fastest-growing states in the u.s. the consequent demand on freshwater for personal, industrial, and agricultural use is depleting the natural resource and destroying the environment. i'm tom maddock. i'm at the university of arizona, and i study hydrology. i work in the area of ground-water/surface-water interactions. basically, the difference between ground water and surface water is you can float a stick in surface water. in ground water, you really can't do that except maybe looking down a well and dropping the stick down the well. narrator: surface water is typically found in lakes, rivers, and streams. ground water is found beneath the earth's surface in small pores and fractures found within large rock formations. when this water is readily available for human use, these formations are called aquifers. almost all of the natural surface water in arizona has been developed, leaving only ground water available for human consumption. dr. maddock: the problem in the southwest is that we basically are having continue
about a minute, unfortunately. >> u.s. news and world report for july 20th lists you as the most influential muslim leader- black, white, or asian. with that kind of leadership, do you expect louis farrakhan to begin to modify his stance, and if so, in what specific areas? >> well, let me say first that most of farrakhan's people and those that he attracts, they don't believe what the u.s. news and world report says. [laughter] >> hey, take it if you get it, right? >> but i do know that minister farrakhan- now i'll share this with you too. we used to be very good friends- i used to go to his home and he used to play violin; we used to laugh and joke and talk. i enjoyed his family, he enjoyed my family. so when we separated, we lost something, we missed something, and we still miss something- we miss this personal friendship we used to have. so he is really watching every step i make, and believe me, i am influencing what he's doing- in a good way, in a positive way. >> well, maybe he will be, but for now, we've run out of time. i want to thank you so much focoming. >> thank you,
be left dry. elsewhere, farms and towns in the path of the new riverbed could be washed away. so the u.s. army corps of engineers has engaged a team of scientists and engineers to hold the river to its present channel. how long the corps can keep the river where it is is really just a matter of money. one of the things about engineering is that that you can do almost anything, given the money. we can basically keep the river where it is. we may have control structures up and down the river, because the river will try to change course to find the shortest distance to the gulf of mexico. it may be not this flood, but maybe the next where a levee might break or else a structure might be flanked or something like that, where the river will try to change its course again. but the corps realized it could not really let this happen. the economies of baton rouge and new orleans depend on the river for its fresh water, for its commerce, its transportation. industries all up and down the river use the fresh water in their processing. in its continuing search for the shortest route to the sea, the
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